Dynamoelectric machine



Nov. 20, 1951 J. w. cLoKEY 2,575,705

DYNAMOELECTRIC MACHINE Filed Sept. 8, 1950 ATTO R N EY atented Nov. 2Q, 1951 UNITED IS TAT ES PATENT 0F *FICE DYNAMOELE CTRIC `MACHIN E John'W. Clokey; Pittsburgh,fP-a., assignorl tolWestinghouse'Electric Corporatioml-East `Pittslmrgh, fPa., al corporation. of Pennsylvania "Application September 8, 1950', Serial'NoLlSSJlGl My invention relates: tor-the stator-construction lindrical form. The around-the-frame winding- -connectionsforfthe coils maybe Vcompleted either Ebefore 'or after vthe cylindrical Vbending of 'the mounting-plate-usually after-and Ithen lthe salientepole assembly which is thus formed can be dipped and baked or otherwise treated to improve the insulationfandtested, before said assembly is inserted into the bore of the rigid statorframe, where it is secured in place by a suitable number of pole-bolts which pass in through the stator-frame.

My invention is particularly applicable to railroad-motors, for traction or auxiliary purposes, and it is particularly applicable to frames which are cylindrical in shape, although, theoretically, at least, my invention could be applied to noncylindrical frames. As a result of my invention, the railroad (or other user of the machine) can more quickly rewind a traction-motor, for example; and a repair-shop which is not fully equipped to wind and treat a large-sized frame might easily install a stator-insert in accordance with my invention.

An exemplary form of embodiment of my invention is illustrated in the accompanying drawing, wherein Figure 1 is a perspective view of a part of a iiat exible mounting-sheet or plate, with some of the poles and coils underneath it;

Fig. 2 is a perspective View of the same thing, turned upside down;

Fig. 3 is an end-view of a drum which is used for winding the stator-insert into a cylindrical shape;

Fig. 4 is an end-view of a completed rolled stator-insert, and

Fig. 5 is a fragmentary longitudinal sectional view of a traction-motor, showing my statorinserted in place in the machine.

As shown in Fig. 5, the complete dynamo-electric machine comprises a salient-pole statormember 6, and a rotor-member 'i mounted for rotation therewithin. While my invention was designed, and is particularly adapted, for tractionmotors, it is obviously adapted to other types of dynamo-electric machines. The rotor-member 'I is illustrated as being of a type having a commutator 8. In accordance with my invention, the stator-member 6 is made of two separable parts,

(CHIH-.252)

-opening I2 thereim preferably in the form rof a cylindrical bore. The youter periphery `of 'the Vstator-insert II has a coniigurationsuitable yfor *iittinglwithin said frame-opening rorbore I2, so

that thev stator-insert can beremovably" retained within theframe In by means of ypole-bolts I3 passinglradially through theA frame.

ln "accordance with vmy invention, Vthe statorinsertconsists of /a relatively thin vflexible Vmag- Ynetizable mounting-plate I5,1which encircles a plurality ofsalient'pole-pieces, which vmay include main poles Il and commutating-poles I8 which carry their usual coils IlC and I8C.

ln the initial assembly of my stator-insert II, the mounting-plate I 5 is flat, as shown in Figs. 1 and 2, and the salient pole-pieces Il and I8 are removably bolted thereto, With the coils in place, as shown at I9 in Fig. 1. rlhe stator-pole assembly is then Wound or bent into a cylindrical shape (or other shape necessary to iit within the frame-opening I2). A convenient tool for assisting in this bending-operation is shown in Fig. 3 in the form of a hollow cylindrical drum 2|, which preferably has outwardly extending threaded pins or bolts 22 therein, for engaging in corresponding poles 23 in the several commutatingpoles I8, as shown in Fig. 2, so as to assist in centering said commutating-poles, which are rela' tively narrow in a circumferential direction'. The pins 22 are then removed from the inside of the drum 2 I, so that the drum can be removed from inside of the cylindrically shaped salient-pole assembly.

As shown in Fig. 4, the stator-coils I lC and I8C are provided with suitable around-the-frame winding-connections 24, which are made either before or after the bending operation-usually after said operation, in a large-sized machine in which the connections are quite sti.

The stator-insert I I is now complete, as shown in Fig. 4. It can now be easily handled, both for completing the coil-connections 2li, and for any necessary dipping and baking for treating the insulation on the windings, and for all necessary testing, after which the finished stator-insert I I may be slipped into the bore I2 of the statorframe I Il, and secured in place by the pole-bolts I3 in the frame.

It will be noted that my invention makes it possible to assemble the various salient pole-pieces of the machine on a at plate I5, as shown in Figs. 1 and 2, thereby facilitating the assembling illustrated details of construction.

l more easily handled, in shops which are limited as to the maximum outer diameters of members which can be handled.

From the standpoint of the customer, a motor having a damaged stator-winding can be easily repaired by removing the pole-bolts i3 and slipping the entire stator-winding assembly VH out of the frame I0, and inserting a new stator-winding assembly, while the old one is being repaired,

In my invention, the ilexible mounting-plate l5 is quite thin. It is made of magnetizable material, so that it forms a part ofthe ux-carrying frame or yoke of the machine. Since this plate is quite thin, old motors which had their salient pole-pieces directly bolted to the heavy statorframe l0 can be converted to my new type by boring the old frames slightly oversize, in order to accommodate the new stator-winding assembly. This permits treating and testing the stator-winding assembly, independently of the frame.

While I have shown only a single illustrative form of embodiment of my invention, I wish it to be understood that I am not limited to the I desire,

4 therefore, that the appended claims shall be accorded the broadest construction consistent with their language.

I claim as my invention:

1. A dynamo-electric machine having a salient-pole stator-member, and a rotor-member therewithin, said stator-member being characterized by having a substantially rigid frame having an axially extending opening therein, and a pole-assembly removably secured within said opening, said pole-assembly comprising a relatively thin flexible magnetizable mounting-plate, salient pole-pieces secured to said mountingvplate, coils carried by said pole-pieces, and

around-the-frame Winding-connections for said coils, said mounting-plate fitting within lsaid Y opening in the frame.

2. The invention as dened in claim 1, characterized by said frame being cylindrical, and its opening being a cylindrical bore.

3. A removable pole-assembly for the statorframe of a dynamo-electric machine, characterized by having a relatively thin flexible magnetizable mounting-plate, salient pole-pieces secured to said mounting-plate, coils carried by said pole-pieces, and around-the-frame windingconnections for said coils.

4. The invention as defined in claim 3, characterized by said mounting-plate having a cylindrical shape.

JOHN W. CLOKEY.

No references cited. 

